.img1{
  position: fixed;
  width: 100%;
  height: 100%;
  top:0;
  left: 0;
  z-index: 9;
}
.img2 {
  position:fixed;
  z-index: 10;
  width: 150px;
  height: 50px;
  left: 40px;
  bottom:135px;
}